* Mobile fix for MM-65084
* Changing test/setup.ts to use a deterministic fill
This avoids the ci issue about parenthesis and is more clear that this is just a fixed sequence for testing, similar to randomUUID above.
* Add setBearerToken and setCSRFToken to Client definition
* Use setClientCredentials and memoize createPkceBundle
* Restoring the preauthSecret back to the Client constructors
This came out of a response to MM-65085: Support Pre Shared Password on server connect where preauthSecret was added in the buildConfig. Claude (correctly imo) identified this as now redundant and so removed it but it is valid to keep it as well. In any case, putting it back to be consistent with ClientTracking and ClientBase.
* Rename PKCE to SAML based terminology, similar to server
* Fix lint issue with too many blank lines at eof
* Removing plain on mobile side
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Co-authored-by: Mattermost Build <build@mattermost.com>
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